Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

While still in Safe Mode,

In the address bar, type about:crashes<enter>.

Note: If any reports do not have BP in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box and paste them in.

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support +++++++++++++++++++++++ If you can't get Firefox to open, you will have to do this the hard way.

https://support.mozilla.org/en-US/kb/mozillacrashreporter Open the file browser / explorer on your computer. Note: You may have to enable Show Hidden Folders / Files. Enter this in the address bar;

Windows: %APPDATA%\Mozilla\Firefox\Crash Reports\submitted Win 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\submitted Win XP/2000: C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Crash Reports\submitted

Mac OS: /Users/<username>/Library/Application Support/Firefox/Crash Reports/submitted Linux: /home/<username>/.mozilla/firefox/Crash Reports/submitted

Copy the most recent 5-7 File Names in the folder. Post the information in the reply box.

I have managed to solve this problem, it appears that when I ran Malwarebytes free scan this morning, it updated and installed a free 14 day trial of the FULL program. After removing Malwarebytes the problem was solved and I was back to being able to run Firefox again, so looks like there is a conflict somewhere.

UPDATE: I should just mention that it was the "14 day free trial" of the extra features that was causing my problem, I reinstalled Malwarebytes but deselected the free trial in my settings and it's fine again. I like to use Malwarebytes for the odd scan as it does seem to find bugs that other scans miss so pleased that I can still use it alongside Firefox.

That was very good work. Well done. Please flag your last post as Solved Problem so others will know.

I should just mention that it was the "14 day free trial" of the extra features that was causing my problem, I reinstalled Malwarebytes but deselected the free trial in my settings and it's fine again. I like to use Malwarebytes for the odd scan as it does seem to find bugs that other scans miss so pleased that I can still use it alongside Firefox.

Contact their support and let them know.